Sunflower seeds are also rich in 100 different kinds of enzymes that regulate hormonal balance in the body. For women especially, the enzymes in the seeds can balance out the production of estrogen and progesterone and prove to be helpful in managing the symptoms of premenstrual syndrome, thyroid and also curb morning sickness which often happens during the first trimester of pregnancy. The Vitamin B6 present in the seeds help synthesize protein and metabolism, promoting body balance.